Gasket for pressure relief disk valves



Oct. 16, 1945. P. B. DRANE `GASKET FOR PRESSURE. RELIEF DISK VALVES l Filed oct. 10, 1944 Eid-E;

INVENTOR Patented Oct. 16, 1945 UNITED spares PATENT OFFICE y GASKET FOR PRESSURE RELIEF DISK VALVES Y Phillips B. Drane, Tulsa, Okla.

Application October 10, 1944, Serial No. 558,029

3 Claims.

annular channeled shaped gasket Jformed fromstretchable and contractble material, and adapted to be stretched over the peripheral edge of the valve so that one of its flanges will be on the upper side of the valve, and the other flange onV the underside for cooperating with the valve seat.

A further object is to so shape the flanges of the gasket whereby air will be expelled therefrom or sucked therein when the valve is slammed to closed position, thereby increasing the resiliency of the gasket.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made Within the scope of what is claimed without departing from the spirit of the invention.

In the drawing:

Figure 1 is a vertical longitudinal sectional view through the pressure relief valve, showing the gasket applied thereto.

Figure 2 is a detail sectional View through one side of the gasket.

Figure 3 is an enlarged detail sectional view' through one side of the disk valve and the gasket, showing the same seated on the hatch flange seat.

Figure 4 is a view similar to Figure 3, but showing a bead on the valve for increasing the air ychamber and resiliency of the gasket when the valve is closed.

Figure 5 is a modified form of valve shown in section along with the gasket.

Figure 6 is a top plan View of the disk valve, showing in dotted lines the contracted sides of the gasket, and in full lines the gasket stretched over the edges of the valve.

The gasket hereinafter set forth and described is particularly adapted for use in connection with tank relief valves of the type shown in my Patent No, 2,183,448, issued December 12, 1939.

Referring to the drawing the numeral I designates the annular or otherwise shaped man hole iiange of a tank and 2 the disk valve seat at the upper edge thereof. Hingedly connected at 3 to the lugs 4 of the ange I is a closure 5, and yieldably connected to the closure 5, by means of an expansion spring 6 is a disk valve l. Disk valves of this type are relatively large, hence it is of prime importance to reduce the cost of applying gaskets thereto and simplifying the operation. The disk valve 'I is a pressure relief valve. Usually, in the same combination, a vacuum relief valve 8 is yieldably carried by the pressure relief valve for relieving vacuum within the tank.

The improved gasket 9 is annular. shaped and channel shaped in cross section as shown in Figure 2l. The flanges Ill and II of the gasket arev spaced apart and the gasket is made relatively small in diameter in relation to the disk valve 'I as shown in Figure 6, and stretched over the edge of the valve. On account of the size of the gasket and to make sure it closely binds against the periphery of the valve "I, the gasket is Apreferably soaked in gasoline before applying to increase its stretchability, and then the gasket is stretched over the valve and allowed to dry, therefore it will be seen that a close peripheral engagement of the gasket with the valve is obtained, and at the same time the application of the gasket to the valve is facilitated;

The inner sides of the flanges I0 and I I are provided with annular beads I2 to stiifen the same, and these beads in turn provided with lugs I3, which engage the upper and lower sides of the valve I and maintain the beads spaced from the valve surfaces so that air between the flanges and the disk surfaces will be compressed and expelled on the valve closing operation, thereby increasing the resiliency of the packing, and at the same time there is a breathing operation of the gasket when the valve is opened and closed. By providing the beads lI2 it is obvious the portions of the gasket flanges between the lugs I3 will not sag into engagement with the surfaces of the valve 'I and prevent the breathing operation.

Referring to Figure 3 the construction and operation is the same, however in this form the under side of the disk valve is provided with an y annular bead I4, which Will increase the amount of air space between the flange II and the disk valve 1, otherwise the operation of the gasket is the same as in Figure 2 and Figure 3.

As hatch covers of this type are slammed to closed position, it will be seen that the air cushioning assists in preventing damage to the gasket.

Referring to Figure 5, in this form, the outer edges I5 of the disk valve 1 are bevelled and tight- 1y seated in a channel I6 in the outer wail I1 of the gasket for preventing leakage, hence it will not be necessary to machine the under side of the disk valve.

From the above it will be seen that a gasket is provided for disk valves which may be easily applied theietewitbelit the use 0i epseial meehiilies of the valve and special holding means for the gasket as is now the common practice. It will also be seen that when the lower flange becomes Worn the gasket may be turned over and the other flange utilized for cooperation with the valve sgat.

The invention having been set forth what is claimed as new and useful is:

l. The combination with a disk valve, of a rchanneled contractible gasket surrounding said valve with one of its anges above and the other below said valve, at least one of said flanges having its free edge stiiened by a bead and lugs carried by the bead and engaging the adjacent surface of the valve for maintaining the bead spaced from the valve.

2. A device as set forth in claim 1-Wherein the remaining 3ans@ is provided with a similar bead and lugs- 3. A device as set forth in claim 1 including an auxiliary channel in the bottom of the channeled gasket and forming a leakproof connection between the marginal edge of the valve and the gasket.

PHILLIPS B. DRANE. 

